Happy Birthday, Olivia Wilde! The Don't Worry Darling actress and director celebrated her 39th birthday this year by rocking a bikini with a friend on Instagram. But of course, she did it in true Olivia fashion, with her toned booty and legs on full display. Also visible was her booty tattoo, which she dubbed a "tramp stamp."

"39 and feeling fine. Thanks for the birthday love. I milked it for way too long and it’s been great. Here’s to whatever’s next. Probably not another tramp stamp but who knows. #shameless #howdareshe #thehorror ♥️," she captioned the pic.

Of course, Olivia's birthday post got lots of love. Trainer Tracy Anderson commented, "I’d put a TA on that cute booty! 39 is such an awesome age!!! It’s going to be an epic year! 🎂🎉♥️♥️♥️♥️♥️," and actress Megalyn Echikunwoke wrote, "🙀🙀🙀🙀 The nerve!"

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